Index: PGResultRow.m
==================================================================
--- PGResultRow.m
+++ PGResultRow.m
@@ -44,11 +44,17 @@
 	[super dealloc];
 }
 
 - (size_t)count
 {
-	return PQnfields(res);
+	size_t i, count, fields = PQnfields(res);
+
+	for (i = count = 0; i < fields; i++)
+		if (!PQgetisnull(res, row, i))
+			count++;
+
+	return count;
 }
 
 - (id)objectForKey: (id)key
 {
 	int col;
@@ -55,10 +61,13 @@
 
 	if ([key isKindOfClass: [OFNumber class]])
 		col = [key intValue];
 	else
 		col = PQfnumber(res, [key UTF8String]);
+
+	if (PQgetisnull(res, row, col))
+		return nil;
 
 	return [OFString stringWithUTF8String: PQgetvalue(res, row, col)];
 }
 
 - (OFEnumerator*)keyEnumerator
@@ -99,19 +108,31 @@
 @implementation PGResultRowKeyEnumerator
 - (id)nextObject
 {
 	if (pos >= count)
 		return nil;
+
+	while (pos < count && PQgetisnull(res, row, pos))
+		pos++;
+
+	if (pos >= count)
+		return nil;
 
 	return [OFString stringWithUTF8String: PQfname(res, pos++)];
 }
 @end
 
 @implementation PGResultRowObjectEnumerator
 - (id)nextObject
 {
+	if (pos >= count)
+		return nil;
+
+	while (pos < count && PQgetisnull(res, row, pos))
+		pos++;
+
 	if (pos >= count)
 		return nil;
 
 	return [OFString stringWithUTF8String: PQgetvalue(res, row, pos++)];
 }
 @end

Index: test.m
==================================================================
--- test.m
+++ test.m
@@ -29,16 +29,16 @@
 				    @"    content text"
 				    @")"];
 	[connection executeCommand: @"INSERT INTO test (id, name, content) "
 				    @"VALUES($1, $2, $3)"
 			parameters: @[@"1", @"foo", @"Hallo Welt!"]];
-	[connection executeCommand: @"INSERT INTO test (id, name, content) "
-				    @"VALUES($1, $2, $3)"
-			parameters: @[@"2", @"bla", @"Blup!!"]];
+	[connection executeCommand: @"INSERT INTO test (id, content) "
+				    @"VALUES($1, $2)"
+			parameters: @[@"2", @"Blup!!"]];
 
 	result = [connection executeCommand: @"SELECT * FROM test"];
 	of_log(@"%@", result);
 	of_log(@"JSON: %@", [result JSONRepresentation]);
 
 	[OFApplication terminate];
 }
 @end